Desk operator&#39;s circuits



W. A. RHODES.

DESK OPERATORS CIRCUITS.

APPLICATION FILED DEC-5,1918.

1,389,596. PatentedSept. 6,1921.

IN VEN TOR.

WK/mdw BY i, Fa

ATTORNEYS.

yUNITED STA S. PATENT ,oFFIce.

wits, and more particularly erators desk.

WILLIAM A. nnonns, or NEW YORK, N.VY.,

ASSIGNOR TO AMERICAN TELEPHONE TELEGRAPH COMPANY, A CORPORATION or NEW YORK.

DESK ornna'ron's CIRCUITS.

T 0 all whom. it may concern. I

Be it known that I, WILLIAM A. 'Rnonns,

residing at New York, in the. county of,

New York and State of New York, have invented certain Improvements in erators Circuits, of which the following is a specification.

This'invention' relates to telephone cirrangements for connecting a subscribers line terminating at a switchboard witha special position such as an information op- Heretofore it has been the practice when circumstances arise rendering it necessary to connect a subscriber to some special operator such as an information operator, to arrange a trunk between the A operators position and the special operators position, so that the A operatorjmay connect the subscriber through the usual cord fcircuit to the special operatonsposition overthe trunk. The special operator in response to the incoming call on the trunk, then ascertains the number of'the party desired by the subscriber and signals the A operator by flashing the latters supervisory lamp.

This method of operation is unsatisfactory,,not only because the A operator does not always notice the fiashingof the lamp, but for further reason that the operation of the information operators flashing key may cause annoying clicks in the waiting subscribers receiver.

It is the object of the present invention to .eliminate,,thesejdifiiculties, and provide a of the number to which the subscriber. v I i from a description of the operation wh chis moredirect method of communlcation between the A operator and the information operator. These results are accomplished by so arranging the trunk between the A operators position and the special operators position, that by the operation of aspecial key at the latter position, the trunk will be disconnected from the calling end of the cord circuit and connected directly over a circultsomewhat similar 'to anorder wire to the telephone set of the A operator who,

set up the connection. The information or special operator can then communicate rectly with the A operator to inform her should beconnected. V The arrangement pos- Desk Opwhich constitutes a circuit to trunking ar-,

embodiment, of the invention.

- fore an plete connections L to otherxsubscri bers lines ortotrunks :such as T. The cord circuitC is provided with a key K whereby theA operators set special circuit to the that the. information operator is connected directly tothe A operator, and can com- -mission loss due to shunting the sesses a further advantage in-that the'conversation between the A operator and. the special operator, is not heard by the. subscriber. V a

The invention may now be more fully understood by reference to the following description when read in connection with thev accompanying drawing, the figure of diagram of one Referring to the drawing, a subscribers Specification'of Letters Patent. I Patented 6, 192 1 Application filed December 5, 1918. Serial No. assess.

substation A is connected by means ofa line L to a central oflice,where it terminates be- P, and P respectively, may be used to comfromsthe 'subscribers line B may be connected to the cord circuit, in

the usual manner. A special'trunk T terminates at the A operators board in a jack and at its opposite end terminates in a jack J 3 located at the desk of the-special operator, such as the information operator.

The information operator is provided with [an operators telephone set D and an operators circuit E, which may be connected to .a plug P by operatinga key K so that by inserting the plug P in the jack J 3 and 0p crating the key K the information operl ators telephone set may be connected to the trunk. The keyK isso arranged. that when thrown in one position a marginal relay in A operators board in a jack J v .At theA operators position, the cord circuit C, having'answeringand calling plugs the trunk is operated 'to disconnect the trunk. 1

from the jack J and connect it over a A ,o erators set so inventionso that the connection between the two telephone sets is of highimpedance. The invention may now be understood as follows: The subscriber at A, upon removing his receiver from the switch hook operates the line relay 1 in the usual manner to actuate the line signal 2. The A operator, upon observing the si nal, inserts the plug P of the cord circuit a in the jack J thereby operating the cut-off relay 3 to eX-' By throwing the cord circuit is inserted in the jack J 2 of thetrunk T leading to the information operators position.- A circuit is thereby completed over the sleeve contacts of the plug 1, and the jack J for the supervisory lamp 4' of the cord circuit and the relay 5 of the trunk T. Relay 5 upon being energized completes a circuit over its front contact and the back contact of relay 6 to lamp 7 at the information operators desk, said lamp apprising-- the information operator that a call is waiting uponthe trunk. The information operator then inserts the plug 1? in the jack J completing a circuit from battery, through resistance 8, over the sleeve contacts of the plug E and the jack J through the winding of marginal relay 9 and through the right hand winding of relay 6 to ground. Relay 9 being marginal is not operated, but relay 6 is operated over this circuit and upon attractingits armature opens the circuit of the lamp"? and completes alocking circuit from battery over the front contact of relay 5, front contact of relay 6 and through the left Winding of said relay to ground. Relay 6, therefore,remains operated'so long as the plug P remains in the jack J 3 and as long as plug'P remains in jack J p When the plug P was inserted in jack J a'circuit for the supervisory relay 10 of the cord circuit C was established from battery through the winding of relay 10, ring contacts of plug P and jack J lower back contact of marginal relay 9,, ring contacts of jack J 3 and plug P right hand winding of coil 11, contact 12 of key K contact13 of said key, left hand winding coil 11, tip contacts of plug P and jack J upper back contact of marg nal relay 9, tip contacts of jack J and plug P to ground. a

The supervisory relay 10 being operated over the circuit just traced, shunts the super visory lamp 4: and extinguishes it, indicatingto the A operator that the information operator has answered the call. The bridge through the windings of coil 11, it will be noted, passes in series over contacts 12 and 13' of the key K so that'the operation of operators telephoneset B is,

whose number does not. appear in the direcrtory, thc informat onoperator, after ascertaining the number of the desired subscriber,

throwing the key K, .to the' the calling subscriber desires to be may throw'the key K to the right, thereby connecting battery over the contact 17 of said key, through the resistance 18 to the sleeve contact of the plug in parallel with a battery through the resistance 8. The current flow 'over the sleeve circuit is thereby I increased to such an extent that the marginal relay 9 is operated to disconnect'the end of the trunk T terminating; in the jack J from the end terminating in 'jack'J and connect the end terminating in the jack J over conductors 19' to the A operators set B. The operation of the relay 9 bridges a coil 20 across the tip and ring contacts of :the jack J so that the supervisory relay 1O 1 remains operated and the lamp 4 is not" affected by this operatlon. The information operator, upon throwing the key K to the right, opens the bridge through coil 11 at contact '12 and at contact 21 completes a circuit for the relay 16. The-tip and ring contacts of the plug 1?, are now connected overmake contacts of the key 1& conductors 22, transformer 23 and front contacts of the {relay 16 to the information operators set D. The secondary" winding of -trans-" forme1fi23 with the condenser forms a high impedance bridge, so that the connection of the information operators set to the A01)- erators set B, over conductors 19, does not cause undue transmission loss due' to the shunting of the-A operators set in case-said 'set is at that moment bridgedacross some other cord circuit in answering a call from another subscriber; Furthermore this arrangement of the circuit'has an additional advantage in that it reduces the transmission between the two operators to a value suitable for a short trunk connection.

The information operator may now communicate to the A operator who originally handled the call, the number of the subscriber' desired by the calling operator at station A, whereupon the A operator removes the plug P from the jackJ and in- 0 inthe Jiack of the (desired sub serts it scriber. This results in the deenergization of the relay 5 which in turn unlocks the reand A operators'set over said lay 6. The information operator, by withdrawing the plug P, from the jack J opens the circuit through marginal relay 9 and the right hand winding of the relay 6, so that the apparatus is restored to normal.

By means of the arrangement above disclosed, a simple method of handling calls between an A operators board and an information operators position is provided, and while the invention is disclosedas embodied in a specific form, it will be obvious that the principles thereof may be embodied in many other organizations widely different from that illustrated, without departing from the spirit of the invention as defined in the following claims.

What is claimed is:

1. In a telephone system, a subscribers line, an A operators position, a trunk leading from the A operators position to a special operators position, a link circuit at the A operators position for switching said line into connection with other lines or with said trunk, means whereby the special operators set maybe associated with said trunk over a low impedance path in response to a connection established therewith, and means whereby when said line is connected to said trunk the special operator may establish a high impedance connection between her set trunk and independent of said link circuit.

2. In a telephone system, a subscribers line an A o erators osition a trunk lead ing from the A operators position to a special operators position, a link circuit at the A operators position for switching said line into connection with other lines or with said trunk,'means whereby the special 0perators set may be associated with said trunk over a low impedance path in response to a connection with, and means whereby the special operator may associate her set with said trunk over a high impedance path to the exclusion the special operators set established thereof the subscribers line while said line is connected to said trunk.

3. In v a telephone system, a subscribers by the special operator may switch said trunk from connection with said link circuit and into connection with the A operators set, and whereby the specialoperators set may be associated with said trunk over a high impedance path during such connection.

4. In a telephone system, a subscribers line;'a trunk leading to aspecial operators position, means whereby said line may be connected to said trunk,means to associate with said trunk over a low impedance path in response to said connection, and means whereby when said line is connected to said trunk the special operators set may be connected to a connecting operator7s set over a high impedance path including said trunk.

to, a

5. In a telephone system, a subscribers line; a trunk leading to a special operators position, means whereby saidline may be connected to said trunk, means to associate the special operators set with said trunk over a low impedance path in response to said connection, and means whereby when said line is connected to said trunk a high impedance connection may be established over said trunk between the special operators set and a connecting operators set.

In testimony whereof, I have signed my name to this specification this third day of December,

WILLIAM A. RHODES. 

